Python oop question

Question

How do I call method .get_item(Example1()).do_something() in class Base from inside the class Example2?

class Base:

    items = []

    def add_item(self, item):
        self.items.append(item)

    def get_item(self, item):
        return self.items[0]

class Item:
    pass

class Example1(Item):

    def do_something(self):
        print('do_something()')

class Example2(Item):

    def __init__(self):
        '''
        How call this method .get_item(Example1()).do_something() ?
        '''

if __name__ == '__main__':

    base = Base()
    base.add_item(Example1())
    base.add_item(Example2())

Are you trying to call another method in the __init__ of Example2 or are you trying to call the __init__ method itself? Actually I can't understand what you are asking. Please provide more information. — Feanor
– Feanor, Commented Sep 9, 2011 at 9:08
I wan't from Example1() or Example2() have access to methods from Base() class. — vladislav godorin
– vladislav godorin, Commented Sep 9, 2011 at 9:12
@vladislav godorin With two "from" in it, your sentence means nothing. Don't you read what you writed before posting ? — eyquem
– eyquem, Commented Sep 9, 2011 at 9:24

Alexander Poluektov · Accepted Answer · 2011-09-09 09:16:13Z

2

If you want such functionality, you need to pass Base to Example2 guy:

class Example2(Item):

    def __init__(self, base):
         self.base = base
         self.base.get_item(Example1()).do_something()

         # or if don't want to store base, and just call its method once:
         base.get_item(Example1()).do_something()

if __name__ == '__main__':

    base = Base()
    base.add_item(Example1())
    base.add_item(Example2(), base)

answered Sep 9, 2011 at 9:16

Alexander Poluektov

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Comments

Martijn Pieters · Accepted Answer · 2012-05-26 17:26:52Z

0

self.get_item(...)

or

Base.get_item(self, ...)

edited May 26, 2012 at 17:26

Martijn Pieters

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answered Sep 9, 2011 at 9:15

Sepp

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